APPENDIX. 
The following pages include a number of species which 
have been added to our fauna since the foregoing pages were 
put in print. Several of these are old species recorded for the 
first time within the limits of the area, while others are new 
species recently discovered. Several additions and corrections 
are also made to the introductory and other portions of Part I. 
The writer is indebted to the following persons for addi- 
tional information: Dr. W. H. Dall, United States National 
Museum, Washington, D. C.; Mr. George H. Clapp, Pittsburg, 
Pa.; Mr. Bryant Walker, Detroit, Mich.; Mr. Edward W. Roper, 
San Diego, Cal. (now deceased). 
p. 11. Lower part of page. The last sentence should be 
changed so as to read: “In all groups except the Pelecypoda 
‘the mouth is provided with a manducatory apparatus (odonto- 
phore, radula or tooth-bearer’’). 
p.12. The sentence stating that ‘‘the subkingdom is of 
quite recent date geologically” should be changed to read, ‘tis 
geologically of very ancient date,’ as the Mollusca are known 
as far back as the Cambrian. 
p. 16. Llanorbis bicarinatus has been found in the North 
Branch of the Chicago River by Mr. Jensen, thus bringing it 
in the northern region. 
p. 18. Lampsilis parvus has been found in the North Branch 
of the Chicago River and in the Little Calumet River, and 
hence belongs to the three regions of the area. Calyculina 
transversa has also been found at Edgebrook and at Blue Island, 
and belongs with the universally distributed species. A/asmo- 
donta rugosa has been found in the North Branch of the Chicago 
River, and should be placed among the species common to all 
regions. The following species are to be added to the univer- 
sally distributed species: 
Alasmodonta deltoidea. North Branch Chicago River and 
Edgewater. 
Polygyra monodon, Wolf Lake. 
Polygyra lean. Evanston, Bowmanville, Edgebrook, etc. 
Bifidaria armifera.. Edgebrook. 
Circinaria concava. Wolf Lake, Hammond, Roby, etc. 
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